Fix Issue (#109)

Fix Issue (#109)

Author: yanjinhuagood

src/WPFDevelopers.Shared/Controls/TimePicker/TimePicker.cs

@@ -25,7 +25,9 @@ public class TimePicker : Control
 
         public static readonly DependencyProperty SelectedTimeProperty =
             DependencyProperty.Register("SelectedTime", typeof(DateTime?), typeof(TimePicker),
-                new PropertyMetadata(null, OnSelectedTimeChanged));
+                new FrameworkPropertyMetadata(null, 
+                    FrameworkPropertyMetadataOptions.BindsTwoWayByDefault | FrameworkPropertyMetadataOptions.Journal,
+                    OnSelectedTimeChanged));
 
         public static readonly DependencyProperty IsCurrentTimeProperty =
             DependencyProperty.Register("IsCurrentTime", typeof(bool), typeof(TimePicker), new PropertyMetadata(false));
@@ -69,7 +71,7 @@ private static void OnMaxDropDownHeightChanged(DependencyObject d, DependencyPro
         protected virtual void OnMaxDropDownHeightChanged(double oldValue, double newValue)
         {
         }
-
+        
         private static void OnSelectedTimeChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
         {
             var ctrl = d as TimePicker;